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  <title>Get the length of a field</title>

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</div><hr /><div id="function.mssql-field-length" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">mssql_field_length</h1>
  <p class="verinfo">(PHP 4, PHP 5, PECL odbtp &gt;= 1.1.1)</p><p class="refpurpose"><span class="refname">mssql_field_length</span> &mdash; <span class="dc-title">Get the length of a field</span></p>

 </div>
 
 <div class="refsect1 description" id="refsect1-function.mssql-field-length-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="type">int</span> <span class="methodname"><strong>mssql_field_length</strong></span>
    ( <span class="methodparam"><span class="type">resource</span> <code class="parameter">$result</code></span>
   [, <span class="methodparam"><span class="type">int</span> <code class="parameter">$offset</code><span class="initializer"> = -1</span></span>
  ] )</div>

  <p class="para rdfs-comment">
   Returns the length of field no. <em><code class="parameter">offset</code></em> in 
   <em><code class="parameter">result</code></em>. 
  </p>
 </div>


 <div class="refsect1 parameters" id="refsect1-function.mssql-field-length-parameters">
  <h3 class="title">参数</h3>
  <p class="para">
   <dl>

    
     <dt>
<em><code class="parameter">result</code></em></dt>

     <dd>

      <p class="para">
       The result resource that is being evaluated. This result comes from a
       call to <span class="function"><a href="function.mssql-query.html" class="function">mssql_query()</a></span>.
      </p>
     </dd>

    
    
     <dt>
<em><code class="parameter">offset</code></em></dt>

     <dd>

      <p class="para">
       The field offset, starts at 0. If omitted, the current field is used.
      </p>
     </dd>

    
   </dl>

  </p>
 </div>


 <div class="refsect1 returnvalues" id="refsect1-function.mssql-field-length-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   The length of the specified field index on success 或者在失败时返回 <strong><code>FALSE</code></strong>.
  </p>
 </div>


 <div class="refsect1 examples" id="refsect1-function.mssql-field-length-examples">
  <h3 class="title">范例</h3>
  <p class="para">
   <div class="example" id="example-1502">
    <p><strong>Example #1 <span class="function"><strong>mssql_field_length()</strong></span> example</strong></p>
    <div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br /></span><span style="color: #FF8000">//&nbsp;Connect&nbsp;to&nbsp;MSSQL&nbsp;and&nbsp;select&nbsp;the&nbsp;database<br /></span><span style="color: #0000BB">mssql_connect</span><span style="color: #007700">(</span><span style="color: #DD0000">'MANGO\SQLEXPRESS'</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">'sa'</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">'phpfi'</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">mssql_select_db</span><span style="color: #007700">(</span><span style="color: #DD0000">'php'</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">//&nbsp;Send&nbsp;a&nbsp;select&nbsp;query&nbsp;to&nbsp;MSSQL<br /></span><span style="color: #0000BB">$query&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">mssql_query</span><span style="color: #007700">(</span><span style="color: #DD0000">'SELECT&nbsp;[name],&nbsp;[age]&nbsp;FROM&nbsp;[php].[dbo].[persons]'</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">//&nbsp;Print&nbsp;the&nbsp;field&nbsp;length<br /></span><span style="color: #007700">echo&nbsp;</span><span style="color: #DD0000">'The&nbsp;field&nbsp;\'age\'&nbsp;has&nbsp;a&nbsp;data&nbsp;length&nbsp;of&nbsp;'&nbsp;</span><span style="color: #007700">.&nbsp;</span><span style="color: #0000BB">mssql_field_length</span><span style="color: #007700">(</span><span style="color: #0000BB">$query</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">1</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">//&nbsp;Free&nbsp;the&nbsp;query&nbsp;result<br /></span><span style="color: #0000BB">mssql_free_result</span><span style="color: #007700">(</span><span style="color: #0000BB">$query</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</code></div>
    </div>

    <div class="example-contents"><p>以上例程的输出类似于：</p></div>
    <div class="example-contents screen">
<div class="cdata"><pre>
The field &#039;age&#039; has a data length of 4
</pre></div>
    </div>
   </div>
  </p>
 </div>


 <div class="refsect1 notes" id="refsect1-function.mssql-field-length-notes">
  <h3 class="title">注释</h3>
  <blockquote class="note"><p><strong class="note">Note</strong>: 
   <strong>Note to Windows Users</strong><br />
   <p class="para">
    Due to a limitation in the underlying <acronym title="Application Programming Interface">API</acronym> used by <acronym title="PHP: Hypertext Preprocessor">PHP</acronym> (MS DBLib C <acronym title="Application Programming Interface">API</acronym>),
    the length of <em>VARCHAR</em> fields is limited to 
    <em class="emphasis">255</em>. If you need to store more data, use a 
    <em>TEXT</em> field instead.
   </p>
  </p></blockquote>
 </div>


 <div class="refsect1 seealso" id="refsect1-function.mssql-field-length-seealso">
  <h3 class="title">参见</h3>
  <p class="para">
   <ul class="simplelist">
    <li class="member"><span class="function"><a href="function.mssql-field-name.html" class="function" rel="rdfs-seeAlso">mssql_field_name()</a> - Get the name of a field</span></li>
    <li class="member"><span class="function"><a href="function.mssql-field-type.html" class="function" rel="rdfs-seeAlso">mssql_field_type()</a> - Gets the type of a field</span></li>
   </ul>
  </p>
 </div>


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